Prequel, Sequel and Interpolation

A prequel is a new story that takes place before the events of the original play. 
It explores backstory, events, or characters’ pasts, helping audiences understand how things came to be in the original work. 

A sequel is a continuation of the original play, showing what happens to the characters or the world after the original story ends.
It builds on unresolved issues, character developments, or themes from the original play, satisfying audiences who want to know “what happens next.” 

An interpolation adds new scenes, dialogue, or events to the time frame of the original play. 
It enriches the existing story by filling in gaps, showing other perspectives, or adding depth to characters.